Math Crossword Puzzle

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Across
  1. 4. a placeholder for an unknown number
  2. 5. a number to the power of three
  3. 9. a quantity representing the power of a number
  4. 11. involving the second or unknown power
  5. 13. to make easier to understand
  6. 17. the product of a variable
  7. 18. a word that stands for what you need to to first in a math equation
  8. 19. having two terms
  9. 20. involving the 1st or unknown power
  10. 21. a set of instructions to solve certain math problems
Down
  1. 1. having one term
  2. 2. the number on the y axis
  3. 3. the unit of measure for an angle
  4. 6. having four or more terms
  5. 7. a picture representing data or numbers
  6. 8. having three terms
  7. 10. a number to the power of two
  8. 12. to become smaller
  9. 14. the ratio of the circumference in any circle
  10. 15. numbers that share a variable
  11. 16. to become bigger